Improved machim fob polishing sphebioal shot and shell



J. B. TARRQ MAGHINE FOR POLISHING SPHERIGAL SHOT AND SHELLS.

Patented July v, 1868.

M" m l. H m I I I I I I n.

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JOHN' BLAKE TARR, OF FALR HAVEN, MASSACHUSETTS,

Letters Patent No, 79,610, dated July 7, 1868.

. IMPROVED MACHINE FOR POLISHING SPHERIOAL SHOT AND SHELL.

TO ALL WHOM IT. MAY CONCERN:

Be it known that I, JOHN BLAKE Tens, of Fair Haven, in the county ofBristol, and State of Massachusetts, have invented a new and improvedMachine for Polishing Spherical ,Shot and Shells; and I do herebydeclare that the following is a full, clear, and exact descriptionthereof, reference being bad to, the accompanying drawings, making partof this specificatiom in which- Figure 1 is an elevation of one'sideofthe improved machine.

Figure 2 is a vertical section taken centrally through the machine.

Figure 3 is a section taken in the horizontal plane indicated by lines:in fig. 1.

Figure 4 is an enlarged'view of the polishing-cups, showing a ballwithin them.

Similar letters of reference indicate corresponding parts in the severalfigures.

This invention relates to a new and improved mode of polishing andsmoothing spherical shot and shell; and it consists in retaining theballs, with emery. or other suitablepolishing-substance, between cups,which are applied upon vertical shafts, whose axes coincide and whichreceive difierent sp'eeds, so that the balls will receive irregular oroscillating motions about their axes, and thus, while being polished,they will remain spherically true, or be rendered so by the operation,as will be hereinafter explained.

To enable others skilled in the art to understand my invention, I willdescrib c its construction and.

operation.

In the accompanying drawings, A represents the horizontal bed of theframe of the machine, which bed 'is elevated upon legs or standards thatare bolted firmly down upon a floor or foundation. This allows freeaccess beneath the bed off the machine for adjusting thestep of one ofthe shafts or spindles, as will be herein after explained. 7

Above this bed are four central hubs, A A A A, from which arms radiate,as shown in figs. 1 and 3, and through the ends of these arms, verticalposts, D D D, pass, which are suitablysecuredto said arms, and also tothe arms of the bed-piece A, the whole constituting a strong andsubstantial frame for sustaining certain shafts in upright positions.

13,13, and 0 represent three shafts, which are arranged in the samevertical line, so that their axes coincide and are sustained bytheseveral horizontal hubsof the main frame, as shown inifig. 2. n Thelowermost shaft B is supported upon an adjustable hardened-metal step,a, beneath the bed A, and to thisshaft a spur-wheel, E,

is keyed, which engages with and receives motion from a correspondingwheel, E, upon avertical'shaft, F. The upper end of this shaft B has acylindrical enlargement, 6, formed on it, in which a socket is formedfor receiving the shank c of a cupped head, G.

- By means of the set-screw e, the head G can be secured fast.

The shaft B,:which is arranged directly above, and in the'same verticalline with shaft 13, also has an enlargement, 6, formed on its end, witha socket in it for receiving the shank of a cupped. head, G. This cuppedhead corresponds in every particular with the head G beneath it.

The-set-screw e is used for securing the upper head in place and to theshaft 13.

The shaft B is required to receive .a vertical end wise movement as wellas arotary movement. The rotary movement is imparted ,to it by means ofalarge horizontal spur-wheel, H, on a main driving-shaft, H, acting upona pinion, 1, upon said shaft B.

Thelarge driving-spur H also engages with a spur-wheel, Elfl'upon thevertical shaft Rand in this manner the two shafts B B are rotated inopposite directions and at different speed. Wheel I being smaller thaneither of the wheels E, E, or E the shaft B will receive the greatestvelocity. The wheel I is applied to its shaft by means of a feather andgroove, as shown in figs. 2 and 3, which will allow said shaft toreceive a vertical movement, whether the machine be in motion or atrest.

Uponthe upper end of the shaft B is a coupling-box, J, keyed or formedon this shaft, so as to turn or move up and down with it. Thisbox J hasa hole bored through its upper end for receiving through it the verticalshaft 0, which letter is connected to said box by means of theenlargedfoot-piecefthat supports shifts" B and allows it to rotate freely. Aforked bracket, 9, which is secured to the bottom of the hub A receivesV the flattened sides of-th'e shaft 0, and prevents it from rotating,but allows it to lnove up and down.

v The upper portion of the shaft C passes freely through the hub A andhas n screw-thread cut upon it, and upon this portion a. largehand-wheel, L, is placed, the hub, h, of which rests upon the hub A, andis held down in place thereon by means of a fixed tooth, g, which entersan annular groove formellin this wheel-hub, as shown in figs. 1 and 2.

The shaft 13 can be raised or depressed by turning the hand-wheel L,'and thus the balls may be removed from or put into the cups in heads'GG at plea-sure. Other means may be employed for raising or depressingthe shaft B, and, if desirable, s spring might be applied to it insnchmanner as. would press the cupped head G down upon the ball X, with ayielding elastic force.

The enlarged view, fig. 4, shows the construction of the cupped heads GG plainly. The ends of these heads are drilled out with a tool, which isthe segment ofa. circle exactly equal in diameter to that of the ballwhich the cups are designed to receive. Then, by means of another tool,the cups are'mnde slightly flaring, as shown at z z.

When the on s are dusted with emerv, or someother suitable olishin-substcnce, and a. ball is laced P i P a P between them, as shown infigs. Qn'nd 4, the ball will fitvsnugly into those portions'of the'cnpsor cavities whichnre mode to conform tojtsfsize and shape.

When the mnchineis started-the cups revolved in opposite directions, ar,if desirable, in the some direction at ditferent speeds-the ball willreceive an irregular oscillating motion about its axis in diiierentplanes, thus bringing different surfaces in contact with the surfaces ofthe two cups,.'which will keep up a constant rubbing action upon theball, and efi'ect the polishing and smoothing of its surface; and, asthe surface of the ball is constantly changing positions with respect tothe cups, the ball will be rendered spherically true, if not perfectlytrue when first put between them.

In practice, a flaring ring or cup may be applied around the upperedgeof'the cupped head G for the purpose of holding the polishing-powderend slowly feeding to the cups,'or e vessel containing thepolishingsnbstanco may be npplied to the frame of the machine above thecups, and provided with a 'pipe leading to the lower cup. There are avariety of ways of introducing the polishing-powder either in a wet ordry condition, and for this reason I shall not pnrticulnrize any oneway.

If desirab'lssnnumber of pairs or sets of polishing-cups may be arrangedin a, gang, and supported by' a single frame, so that the operation ofpolishing a. number of balls atthe same time may be conducted with greatfacility.

Having described-my invention, what I claim as new, and desire to secureby Letters Iatent, is

1. The within-described machine, which is adapted for polishingspherical shot and shells, substentially in. the manner described.

2. The cupped polishing and centring-devices G G, constructed,errang cd,and operating substantially as described.

JOHN BLAKE TARR.

Witnesses:

R; T. CAMPBELL, Enw. SOHAFER.

